Abstract
Gas sensors have been fabricated based on field ionization from titanium oxide nanotubes grown on tita- nium foil. Ordered nanaotube arrays of titanium oxides were grown by the anodization method. We measured breakdown voltages and discharge currents of the device for various gases. Our gas ionization sensors (GIS) presented good sen- sitivity, selectivity, and short response time. The GISs based on TiO2 nanotube arrays showed lower breakdown voltage, higher discharge current, and good selectivity. An excellent response observed for Ar compared to other gases. Besides, by introducing 2 % CO and 4 % H2 to N2 flow gas, the amount of breakdown voltage shifts about 20 and 70 volts to the lower values, respectively. The GIS works at room tem- perature and has the ability of detect inert gases with high stability and good linearity. Besides, short response time of about 1 second for the GISs based on TiO2 nanotube arrays makes them excellent for gas sensing applications. Sharp edges of the nanotubes, through enhancing the applied elec- tric field, reduce operating voltage to the reasonable values and power consumption.
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